Oysters as well as scallops, mussles, and some clams are very short lived...many less than a year and most people don't bother with the marine varieties because it can get costly to keep a constant population. That's my guess. I have seen scallops, mussles, and of course clams available for the aquarium, but never oysters. They're always in the supermarket frozen in the seafood section. Maybe they are cold water??? You have a good question there. I'm interested in reading what others might know or guess.

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We, as a people, know so much more about outer space than we do about our own oceans. This lack of knowledge can very well spell the dangers that lay in wait for us.

The oceans surely would swallow us before a rock comes down to smite the planet of it's life.
Nov/2004

In NY they have Oysters in the Supermarket that are alive not fozen and they are not all cold water species. The Gulf of Florida has some nice Clams and Oysters that they ship up here.
I have clams from the supermarket in my fuge and they are doing fine (don't see them much)
Just last week I was thinking about trying a Oyster in my fowlr, I saw them at the supermarket.
I have some type of hitch hiker Mussle in my reef and it has grown from nothing to about 2" long in the past year.